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See attachment below and find the equivalent of tan(∠qsr)

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis